O'Brien and Bashir help two warring races, the Kellerans and T'lani, erase all knowledge of a deadly biological weapon, but are not trusted to keep what they have learned a secret.
Air Date: 01/30/94
Director: Winrich Kolbe
Very neat episode but I am wondering how Bashir cured O'Brein so easily since he was infected with some genetic weapon that was supposed to be so terrible. This one adds more depth to what will, I am sure, become the Geordi/Data team of DS9.